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26 Cards in this Set
- Front
- Back
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pericadium
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tough, fibrous externl layer
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pariental layer
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lining the pericadium
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visceral layer
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covering the surface of the heart
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pericardial space
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the space between the visceral layer and the pariental layer and contains several drops of pericardial fluid
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myocaedium
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the middle layer, the heart muscle itself
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endocardium
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the inner most lauer that lines the chambers of the heart and covers its valves
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atrium
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cranial chamber
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ventricle
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ventral chambers
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interatrial septum
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divides the atria into right and left sides
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interventricular septum
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divides the ventricles into right and left sides
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mitral or bicuspid valve
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left atrium and ventricle are separated(2 flaps)
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tricuspid valve
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right atrium and ventricle are separated(3 flaps)
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semilunar valve
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(half-moon shape) prevents backflow of blood
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pulmonary artery
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___________________
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sinoatrial node (SA) AKA: pacemaker
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consisting of cells in which electrical impulses originate, produce ateial contractions and force blood into the ventricles
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atricentricular node
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consisting of conductile cekks through which the electrical impulses continue down
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atricentricular bundle (bundle of his)
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continues on as the purkinje fibers
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purkinje fibers
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move the impulses on the stimulate centricular contraction.
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autonomic nervous system
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2 divisions with opposite actions on the heart
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parasympathetic nervous system
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mainly supplying the SA and AV nodes, slows the heart rate
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sympathitic division nervous system
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acts on the SA and VA nodes to increase heart rate
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systole
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contraction
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diastile
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relaxation
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arteries
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carries oxygenated blood from the heart all over the body
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capillaries
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very thin-walled vessels that communicate with other capillaries
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veins
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hollow tubes, similar to the arteries, with thinner and less elastic walls, that transports blood back to the heart
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